[llvm-commits] [llvm] r164676 - /llvm/trunk/lib/Support/Unix/Path.inc
Sylvestre Ledru
sylvestre at debian.org
Wed Sep 26 01:30:35 PDT 2012
Author: sylvestre
Date: Wed Sep 26 03:30:35 2012
New Revision: 164676
URL: http://llvm.org/viewvc/llvm-project?rev=164676&view=rev
Log:
The assumption that /proc/self/exe always exists is incorrect.
For example, under a Linux chroot, /proc/ might not be mounted.
Therefor, we test if this file exist. If it is the case, use it (the current
behavior). Otherwise, we fall back to the detection used by *BSD.
The issue has been reported initially on the Debian bug tracker:
http://bugs.debian.org/674588
Modified:
llvm/trunk/lib/Support/Unix/Path.inc
Modified: llvm/trunk/lib/Support/Unix/Path.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Unix/Path.inc?rev=164676&r1=164675&r2=164676&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Unix/Path.inc (original)
+++ llvm/trunk/lib/Support/Unix/Path.inc Wed Sep 26 03:30:35 2012
@@ -261,7 +261,8 @@
}
#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
- defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__)
+ defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
+ defined(__linux__) || defined(__CYGWIN__)
static int
test_dir(char buf[PATH_MAX], char ret[PATH_MAX],
const char *dir, const char *bin)
@@ -337,9 +338,17 @@
return Path(exe_path);
#elif defined(__linux__) || defined(__CYGWIN__)
char exe_path[MAXPATHLEN];
- ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path));
- if (len >= 0)
- return Path(StringRef(exe_path, len));
+ StringRef aPath("/proc/self/exe");
+ if (sys::fs::exists(aPath)) {
+ // /proc is not always mounted under Linux (chroot for example).
+ ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
+ if (len >= 0)
+ return Path(StringRef(exe_path, len));
+ } else {
+ // Fall back to the classical detection.
+ if (getprogpath(exe_path, argv0) != NULL)
+ return Path(exe_path);
+ }
#elif defined(HAVE_DLFCN_H)
// Use dladdr to get executable path if available.
Dl_info DLInfo;
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